JPH0144634Y2 - - Google Patents

Description

[Detailed explanation of the idea] The present invention relates to a shield tunneling machine.

Normally, in a slurry-type shield excavator, slurry is injected into the excavated soil taken into the pressure chamber in the cutter head and kneaded, and the excavated soil is turned into ready-mixed concrete using a ribbon-screw-type soil removal device to reduce atmospheric pressure. It is being transported to the room. Incidentally, excavated earth and sand contains large solid objects such as boulders, and conventionally, the excavated earth and sand are discharged as they are by a ribbon screw type earth removal device. However, since the large solids are large and heavy, they have the disadvantage that they are difficult to handle when transported from the earth removal device to the outside of the mine.

Therefore, the purpose of the present invention is to provide a shield excavator that can eliminate the above-mentioned drawbacks.The feature is that the excavated soil taken into the pressure chamber in the cutter head is transferred to the atmospheric pressure chamber side. A hollow shaft body that opens at a position rearward from the tip of the ribbon screw blade located in the pressure chamber is disposed in the center hole of the ribbon screw blade of the ribbon screw type earth removal device to be transported, and the hollow shaft body A large solid material crushing breaker is inserted into the tip of the pressure chamber, and a cylinder device is provided inside the hollow shaft body for moving the breaker in and out of the pressure chamber.
According to this configuration, even if large solids are taken into the pressure chamber, they can be crushed by the breaker, making it easier to transport the excavated soil to the outside of the mine from the earth removal device. can be made smaller.

An embodiment of the present invention will be described below with reference to FIGS. 1 and 2. Reference numeral 1 designates a cutter head rotatably supported via a bearing 3 at the front of the shield body 2, and is rotationally driven by a rotary drive device (for example, a hydraulic motor) 5 interlockingly connected to a ring gear 4 provided at the rear of the cutter head. Ru. A pressure chamber 8 is formed in the cutter head 1 for taking in excavated earth and sand through an opening 7 provided in a face plate 6 thereof and converting it into slurry. The opening 7 is made larger as it goes away from the center so that large coarse solids A such as boulders can pass through. 9 is a scraping plate provided in the pressure chamber 8. Reference numeral 10 denotes a ribbon screw type soil removal device for conveying the excavated earth and sand in the pressure chamber 8 to the atmospheric pressure chamber 11 side. A cylindrical casing 13 is formed with a pocket portion 13a for holding the large solid material A in the casing 8, and a discharge port 13b for excavated earth and sand that opens toward the atmospheric pressure chamber 11 at the rear end. It is composed of a ribbon-shaped screw blade 14 that is rotatably disposed inside. The ribbon-shaped screw blade 14 is rotationally driven via a rotating ring 15 fixed to its rear outer periphery. That is, the rotating ring 15 is supported via a bearing 16 in an annular recess 13c formed at the rear of the cylindrical casing 13, and a ring gear 17 is attached to the outer periphery of the rotating ring 15. Furthermore, this ring gear 17 is connected to a pinion (not shown). It is operatively connected to a rotary drive device (not shown) via a rotary drive device (not shown). Reference numeral 18 denotes a hollow shaft body disposed within the center hole 14a of the ribbon-shaped screw blade 14, the front end of which is located behind the tip of the ribbon screw blade 14 located within the pressure chamber 8, and is located at the rear of the pressure chamber 8. It is opened at a position corresponding to the partition wall 12, and its rear end protrudes from the cylindrical casing 13 toward the atmospheric pressure chamber 11, and a lid 19 is attached thereto. The front part of the hollow shaft body 18 is slidably supported by the ribbon-shaped screw blade 14, and the rear part thereof is supported by the shield body 2 or the cylindrical casing 13. A breaker 2 for crushing large solids A is provided at the front part of the hollow shaft body 18.
0 is inserted, and the breaker 2 inside the hollow shaft body 18
At the rear position of 0, as shown by arrow B in Figure 1,
A cylinder device (hydraulic or pneumatic) that moves the breaker 20 into and out of the pressure chamber 8
21 are arranged. 22 is cylinder device 2
A hose for supplying working fluid to 1, which is inserted through the lid 19. 23 is the hollow shaft body 18
, and the discharge port 13b is slidable in the axial direction thereof.
This cone valve is externally fitted and held at a position corresponding to the drain port 13b, and is used to open and close the discharge port 13b.
Further, 24 is a slurry injection pipe inserted through the rear partition wall 12 of the pressure chamber 8.

In the above configuration, the cutter head 1 is rotationally driven and the excavated earth and sand taken into the pressure chamber 8 through the opening 7 is mixed with slurry in the pressure chamber 8 and is transferred to the cylindrical casing 1 by the ribbon-shaped screw blades 14.
3, where a sand plug capable of resisting the face collapse earth pressure or groundwater pressure is formed,
Then, it is continuously discharged onto the belt conveyor 25 from the discharge port 13b. When large solid objects A such as boulders are mixed in the excavated earth and sand taken into the pressure chamber 8, this large solid object A is lifted upward by the scraping plate 9 and then shaped into a cylindrical shape. A large solid object A is dropped and held in a pocket part 13a at the front end of the casing 13, and is held in this pocket part 13a.
is crushed by the protrusion of the breaker 20. Note that the breaker 20 is automatically opened and closed continuously or at regular intervals.

According to the above configuration, even if a large solid substance is taken into the pressure chamber, the breaker moves in and out from inside the hollow shaft body to the center hole of the tip of the ribbon screw blade in the pressure chamber, so the hollow shaft body Even with the surrounding ribbon screw blades with small conveying force, the excavated earth and sand can be transported continuously to the atmospheric pressure chamber side, forming a sand plug that maintains the pressure inside the pressure chamber in the ribbon screw type soil removal device. This makes it easier to transport the excavated earth and sand from the earth removing device to the outside, and it is possible to downsize the earth removing device.

[Brief explanation of the drawing]

The drawings show one embodiment of the present invention, with FIG. 1 being a general longitudinal sectional view and FIG. 2 being a front view. 1...Katsuta head, 2...Shield body, 8
... Pressure chamber, 10 ... Earth removal device, 11 ... Atmospheric pressure chamber, 12 ... Rear bulkhead, 13 ... Cylindrical casing, 13a ... Pocket part, 13b ... Discharge port,
13c...Annular recess, 14...Ribbon-shaped screw blade, 14a...Center hole, 18...Hollow shaft body, 19...Lid body, 20...Breaker, 21...
Cylinder device, 24... slurry injection pipe.

Claims (1)

[Scope of utility model registration request] The tip of the ribbon screw blade located inside the pressure chamber is placed in the center hole of the ribbon screw blade of a ribbon screw type earth removal device that transports the excavated soil taken into the pressure chamber in the cutter head to the atmospheric pressure chamber side. A hollow shaft body that opens at a position rearward from the shaft is disposed, a breaker for crushing large solids is inserted into the tip of the hollow shaft body, and the breaker is directed into the pressure chamber inside the hollow shaft body. A shield excavator characterized by being equipped with a cylinder device for moving in and out.